If in the middle of the flight, you are told that you were surprise - banned from flying over multiple countries in your flight plan, you are forced to abort your flight and land, unless you want the plane to run out of fuel and crash in the middle of nowhere.
And again - this is a pointless semantics game. Yes or no - is messing with airplanes, in flight, in order to make political arrests acceptable behaviour? You seem to think so (As long as its done in some particular way.)
The only difference is that one of the two planes had more options for where it could land. Both had to land at somewhere other than their destination, though, unless the pilots wanted everyone on board to die.
I don't give a rat's ass if France, Spain, Portugal, and Italy can deny an in-flight commercial airplane access to their airspace to make a political arrest. They clearly can, and did. I am asking you if they should do that. Does that seem right to you?